If the tube is pressed into the cast iron block like I think it is, and if there isn't enough of the tube to protruding to grab with a pair of pliers, then you are going to need to jamb something thin in between the cast iron hole and the outside of the tube. Doing so should make the tube collapse inward towards the center, thus moving the walls of the tube away slightly from the hole, enough to use a pair of needle nose pliers to grab it and pull it out.
Dan
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